linux-kernel - Re: [PATCH 00/21] block atomic writes

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Message-ID: <378f6c3b-5c4d-4df8-ae1e-e8abb9ee47a3@acm.org>
Date:   Fri, 29 Sep 2023 07:58:23 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     John Garry <john.g.garry@...cle.com>, axboe@...nel.dk,
        kbusch@...nel.org, hch@....de, sagi@...mberg.me,
        jejb@...ux.ibm.com, martin.petersen@...cle.com, djwong@...nel.org,
        viro@...iv.linux.org.uk, brauner@...nel.org,
        chandan.babu@...cle.com, dchinner@...hat.com
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, tytso@....edu, jbongio@...gle.com,
        linux-api@...r.kernel.org
Subject: Re: [PATCH 00/21] block atomic writes

On 9/29/23 03:27, John Garry wrote:
> The atomic writes feature requires dedicated HW support, like
> SCSI WRITE_ATOMIC_16 command.

This is not correct. Log-structured filesystems can implement atomic
writes without support for atomic writes in the block device(s) used
by the filesystem. See also the F2FS_IOC_*_ATOMIC_WRITE ioctls. This
being said, I hope that atomic write support will be added in the
block layer and also that a single interface will be supported by all
filesystems.

Thanks,

Bart.